01 - Preheat oven to 350°F. Line an 8-inch square baking pan with parchment paper.
02 - In a large bowl, whisk together melted butter, granulated sugar, and brown sugar until glossy and combined.
03 - Add eggs and vanilla extract to the mixture, beating until smooth and slightly thickened.
04 - Sift flour, cocoa powder, and salt into the wet ingredients. Fold gently until just combined, avoiding overmixing.
05 - Stir in chopped dark chocolate evenly into the batter.
06 - Pour batter into prepared pan, smooth the surface, and bake for 22 to 25 minutes until edges are set but center remains slightly fudgy.
07 - Let brownies cool in the pan for 10 minutes before cutting into squares while still warm.
08 - Serve each warm brownie with a scoop of vanilla ice cream. Optionally, garnish with chocolate sauce, nuts, or fresh berries.